1. Find each of the following. Write each complex number in the form x+ iy. (a) Write (-2 – i) in polar form (approximate the angle to 4 decimal places). (b) e*+(#"/s) = exp (1+i(:)) = 2. Prove the following. (a) 2e-cos(iz) –1=e2= (b)(sin(z)) = cos(2)

Q: 7x Cos + COS cos 2.

A: According to trignometry formula:cos a +cos b =2cosa+b2 cosa-b2Given,cosx2+ cos7x2a=x2; b=7x2

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A:

Q: sin(0) = - 2 V3 csc 0 = 2. cos 0 = -. Cos O sin 0 cos 0 = 0.

A: Please refer the attached image for complete solution. THANK YOU.

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A: First represent cosz in exponential form then make quadratic equations to find solutions as in next…

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Q: Prove:  cos(π   + x)        2             =−sinx     Please write clearly thank you.

A: We have to prove that cosπ2+x=−sinx. Use formula cosA+B=cosAcosB−sinAsinB Here, A=π2 and B=x Hence,…

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